Lectures on Practical Astronomy and Astronomical Instruments
Lectures on Practical Astronomy and Astronomical Instruments, by the Cambridge astronomer James Challis, was published by Deighton, Bell and Co. in 1879 for students of observational astronomy. The engravings pair lettered geometric diagrams of angles and arcs with line drawings of sextants, transit circles and eyepiece micrometers, offering designers precise instrument profiles, graduated scales and reticle patterns.
